Damn, looks legit because when I searched for Co2 tablets on Amazon I found some and the description says: "Save the hassle of preparing DIY yeast bottles!".
Yes they do . You have to find a way to suspend above your plants though . Also co2 only really works with a sealed room If life gives you lemons You make lemonade
I looked a bit into it never tried but. What I seen a lot was the answer came to no. It's a short term thing,many there are normally a lot of other things you can improve before starting to think about co2. They say you want to keep a constant ppm of 1400, and that's really hard to control with these methods or even monitor. And in order to really know if it's making an effect or worth the trouble, need to grown the strain a bit to know your yields to compare it. That's just my thoughts.
Yeh they do Exhail bags as well that use mushrooms to do the same thing If life gives you lemons You make lemonade